Apparatus and method to diagnose a NOX sensor
US9109493B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2010 |
| Grant date | Aug 18, 2015 |
| Priority date | — |
| Expiry date | Feb 24, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method includes raising a temperature of an SCR catalyst for a predetermined time period while dosing urea. The method further includes maintaining the temperature of the SCR catalyst without dosing urea for a second predetermined time period. The method further includes filtering out at least low frequency data from a first NOx sensor upstream of the SCR catalyst and from a second NOx sensor downstream of the SCR catalyst, and comparing the filtered data from the first NOx sensor and the second NOx sensor without dosing urea over a third predetermined time period. The method further includes providing a NOx sensor condition index for at least one of the first NOx sensor and the second NOx sensor in response to the comparing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.